This example represents a 54 hour accumulation of a field produced by a forecast started on 20120101 00Z.
- In bold, the values are fixed. They are meant to be used by all partners
- In green, these are the values for the example.
| Time ( accumulated ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Start of forecast ( section 1 ) | |||||||||
Octets | reforecastOctets real time | Fixed values to be used by all the partners | Example | 12Values | Meaning of values | Grib_api key | |||
| 12 | Significance of Reference Time | =1 | Start of forecast | = 1 | 13-14|||||
| 13-14 | Year (four digits) | 2012 | year of start of forecast | dataDate= | 20121520120101 dataTime=0 | ||||
| 15 | Month | 01 | month of start of forecast | = 01 | 16 | ||||
| 16 | Day | 01 | day of start of forecast | = 01 | 17 | ||||
| 17 | Hour | 00 | hour of start of forecast | = 00 | |||||
| Accumulation ( section 4 e.g. template 4.11 ) | 18|||||||||
| 18 | Indicator of unit of time range | = 1 | Hour | = 1 | |||||
| 19-22 | 19-22 | Forecast time | = 0 | Start of forecast + forecast time = start of average period | Accumulation starts at step=0 | startStep=0 | |||
| 45-46 | 38-39 | year of end of overall time interval | 2012 |
End of average period | = 2012 | 47accumulated period, 20120103 06Z |
endStep=54
| ||
| 40 | month of end of overall time interval | = 01 | 48|||||||
| 41 | day of end of overall time interval | = 03 | 49|||||||
| 42 | hour of end of overall time interval | = 00 | 5206 | ||||||
| 45 | number of time ranges | = 4 6 hourly fields used in average | 53-561 | Only one type of time statistics used (accumulation) | |||||
| 46-49 | total number of data values missing in statistical process | = 0 | = 0 | 57||||||
| 50 | Statistical process used to calculate the processed field from the field at each time increment during the time range | = 1 | AccumulatedAccumulation | stepType= 0accum | |||||
| 58 | 51 | Type of time increment between successive fields used in the statistical processing | = 2 | Successive times processed have same start time of forecast, forecast time is incremented | = 2 | 59||||
| 52 | Indicator of unit of time for time range over which statistical processing is done | = 1 | Hour | = 1 | 60-63|||||
| 53-56 | Length of the time range over which statistical processing is done, in units defined by the previous octet | = 2454 | Daily average | = 24 | 64
| ||||
| 57 | Indicator of unit of time for the increment between the successive fields used | = 1255 | Hour | = 1 | 65-68Missing | ||||
| 58-61 | Time increment between successive fields, in units defined by the previous octet | Time frequency used to compute the daily mean | = 6 6 hourly fields used in average | ||||||
Time ( reforecast ) section 4, template 4.61 | ||
|---|---|---|
| Example | ||
| 38-39 | Year of model version | 2013 |
| 40 | Month of model version | 01 |
| 41 | Day of model version | 01 |
| 42 | Hour of model version | 00 |
| 43 | minute of model version | 00 |
| 44 | second of model version | 00 |
The example of reforecast with the example of daily average define together a reforecast of the daily average valid for 2/1/2012 computed with a model version operational on the 1/1/2013.
| 0 | 0 |
|---|
Examples of grib2 headers:
For real time forecast the template to be used is 4.11 and there isn't any information regarding the date and time of the model version.